HID light source means HID equiptment which is what has been on the market with the Philips/hella ballasts the slim and bulky models for years already. It's also for the bulbs as each box has a unique product number.
BTW, this is very similar as to what they did before with the "bosch" they were distributing and obtaining from the philipines. Now, they changed it to Philips. Here's some further proof:
